The ornamental design for a wireless portable displayscreenassembly, as shown and described.
FIG. 1 is a front, right perspective view of a wireless portable display screen assembly showing our new design in which the display screen is detached from a charge terminal and used wirelessly;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front, right perspective view of the wireless portable display screen assembly showing our new design in which the display screen is coupled to the charge terminal;
FIG. 9 is a front view thereof;
FIG. 10 is a rear view thereof;
FIG. 11 is a left side view thereof;
FIG. 12 is a right side view thereof;
FIG. 13 is a top plan view thereof; and,
FIG. 14 is a bottom plan view thereof.
The surfaces bound by broken lines in FIGS. 7 and 14 form no part of the claimed design. The broken lines in the figures depict portions of the wireless portable display screen assembly that form no part of the claimed design.